body {
    padding: 50px 0;
    width: 90%;
    margin: auto;
    font-family: "钉钉进步体";
    background-color: rgb(13, 17, 23);
    color: white;
}

.red {
    color: red;
}

h1 span {
    background-color: red;
}

h1.step {
    margin: 30px 0;
    background-image: linear-gradient(to right, white, rgb(13, 17, 23));
    color: rgb(0, 0, 0);
}

p {
    font-size: 25px;
    text-indent: 2em;
}

.imgBox {
    display: flex;
    flex-direction: row;
}

.imgBox img {
    padding: 10px 20px;
    width: 100px;
    flex: 1;
}

.notebook {
    padding: 20px 10px;
    width: 500px;
    margin: auto;
    background-color: #fff;
    color: black;
    font-family: consola;
    line-height: 25px;
    border-radius: 10px;
}

.cmd {
    padding: 20px 10px;
    width: 850px;
    margin: auto;
    background-color: black;
    color: #fff;
    font-family: consola;
    line-height: 25px;
    border: 1px solid #7d7d7d;
    border-radius: 10px;
}

a {
    font-family: 黑体;
    text-decoration: none;
    color: rgb(35, 134, 54);
}

a:hover {
    color: rgb(183, 255, 198);
}

.underline {
    border-bottom: red 3px dashed;
}